Lophotrochozoans

Concept: Lophotrochozoans

10m

Concept: Mollusks

7m

Concept: Annelids

7m

Lophotrochozoans Additional Practice Problems

We are somewhat flattened and our dorsal surface is convex and covered with 8 articulating plates. We occur on rocky surfaces in the intertidal regions and our radula scrapes algae off the rocks. Our mantle forms a girdle around the margin of our plates and on each side of the foot is a row of gills suspended from the roof of the mantle cavity. Which of the following has our correct taxonomy?

A. Phylum Mollusca, Class Gastropoda

B. Phylum Nematoda, Class Bivalvia

C. Phylum Mollusca, Class Polyplacophora

D. Phylum Mollusca, Class Bivalvia

Watch Solution

Which one of the following is incorrect concerning molluscs?

A. Some members of the Phylum Mollusca are filter feeders.

B. All members of the Phylum Mollusca have a radula.

C. Not all members of the Phylum Mollusca have an external shell.

D. Some members have direct development and do not produce larval stages.

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The key evolutionary advance in annelids is

a. cephalization

b. coelom

c. segmentation

d. lophophore

e. deuterostome development

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Which of the following belongs to the phylum Annelida?

a. polychaetes

b. gastropods

c. nematods

d. arthropods

e. cephalopods

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Which of the following is not a characteristic of most annelids?

a. nephridia

b. closed circulatory system

c. segmentation

d. pseudocoelom

e. setae

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Gastropods, cephalopods, and bivalves all share

a. a mantle

b. tentacles

c. a radula

d. an external shell

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The first segmented animals to evolve were:

a. rotifers

b. cephalopods

c. arthropods

d. echinoderms

e. annelids

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Which one of the following is not a characteristic shared by all mollusks?

a. a mantle

b. gills

c. a radula

d. a coelom

e. All of the above are shared by mollusks.

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Which of the following statements about annelids and flatworms is correct?

a. Both have a complete digestive tract.

b. Both have a body cavity of one type or another.

c. Both have a closed circulatory system.

d. Flatworms are unsegmented, whereas annelids are segmented.

e. b, c, and d are true.

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Bivalves use _______________ to convey food to their mouths

a. cilia

b. parapodia

c. palps

d. setae

e. flagella

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Most bivalve mollusks are

a. parasites

b. commensuls

c. predators

d. saprophytes

e. filter feeders

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The first larval stage of mollusks is the

a. naiad

b. trochophore

c. planula

d. veliger

e. oligophore

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The only class of mollusk to have a closed circulatory system includes the

a. polychaete

b. brachiopod

c. snail

d. oyster

e. octopus

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Most marine gastropods have a lid, called the _______________ , that can close off the opening to their shell.

a. rostrum

b. prorostrum

c. osculum

d. operculum

e. rellium

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Sexually, earthworms are

a. separate sexed

b. hermaphroditic but not self-fertilizing

c. parthenogenic

d. hermaphroditic and self-fertilizing

e. none of the above

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If you can't tell a squid from an octopus, count their tentacles. Squids have

a. 12

b. 16

c. 8

d. 10

e. 80-90

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The molluscan radula is used for

a. reproduction

b. locomotion

c. respiration

d. circulation

e. food getting

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Presumably the complex eyes of _______________ enable them to escape predators.

a. snails

b. scallops

c. oysters

d. giant clams

e. whelks

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Which of the following mollusks is internally segmented?

a. chiton

b. gastropod

c. cephalopod

d. none of the above

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A rasping radula is characteristic of all mollusks except

a. bivalves

b. cephalopods

c. gastropods

d. chiton

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Key evolutionary advances of the solid worms are bilateral symmetry and:

a. a coelom

b. internal organs

c. a one-way digestive tract

d. a body cavity

e. a circulatory system

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Sexually, most flatworms are

a. parthenogenic

b. asexual

c. hermaphroditic

d. amorphous

e. aphrodisiac

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For excretion, flatworms use

a. nephridia

b. flame cells

c. osmosis

d. regurgitation

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